Update version number, special thanks, CHANGELOG and README in prepar…

…ation for possible 0.6.2 release

Updated version number and CHANGELOG for possible 0.6.1 release

Updated gamecontrollerdb.txt from upstream

Updated version string for 0.5.1 release

Update version number for stable release

Final 0.4.1 changelog update

Fix OS X build

Final change to CHANGELOG for 0.3.1

Fix missing include

Added CHANGELOG